Year	Number of
1990	36000
1991	40980
1992	44940
1993	49450
1994	54160
1995	59470
1996	64540
1997	71240
1998	78960
1999	87970
2000	98510
2001	109400
2002	120100
2003	128600
2004	133400
2005	135400
2006	135400
2007	135300